Many states have enacted which require that the first time a dog bites, the owner is warned. If the dog bites again, the law provides that the dog be euthanized. For pit bulls, whose attacks are so intense, and so frequently result in severe maiming or death of the victim, a one bite allowance is one bite too many. A further problem in making laws to control these dangerous and unpredictable animals is that there is no clear-cut genetic standard for what constitutes a pit bull terrier. The lack of a clear standard allows irresponsible owners and breeders to challenge breed-specific laws.